Multiple individual rewind machine



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MULTIPLE INDIVIDUAL REWIND MACHINE 8 Sheets-Sheet 8 Filed Oct. 2, 1964United States Patent OfiFice 3,29L4i2 Patented Dec. 13, 1966 MULTIPLEHNDIVIDUAL REWHND MACHINE Leonard Roekstrom, Madison, (Jharles Aaron,West Caldwell, and Thomas I. Crowe, Dover, Ni, and

Joseph Pnndyir, New York, N.Y., assignors to Cameron Machine Company,Dover, Ni, a corporation of New York Filed Oct. 2, 1964, Ser. No.491,916 13 Claims. (Cl. 242-65) This invention relates to rewindmachines and more particularly to apparatus for receiving a relativelywide mill supply roll, dividing the web into longitudinally extendingsub-webs and rewinding each sub-web into a separate rewind roll. Variousapparatus for rewinding webs of sheet material have been used anddescribed in the literature. However, such prior art apparatus of thisgeneral type have not been completely successful in controlling all ofthe factors required for producing a high quality rewind roll,particularly with such sheet materials as are of a non-uniformed caliberor thickness throughout the length thereof or with certain material-ssuch as high slip paper or plastic films.

In view of the foregoing, this invention contemplates the provision of arewind machine having a plurality of pairs of rewind arms, each sectionbeing pivotally mounted at their inner ends and provided with means attheir outer ends for receiving a strip of sheet material to be woundinto a rewind roll. Said means may include chucking means for holding arewind roll core upon which the sheet material is to be rewound, oralternatively, a re wind shaft may be supported at the outer ends of therewind arms for receiving the sheet material. Means are provided forindividually driving the rewind cores with a preselected driving torqueand, hence, each rewind roll determines its own rotational speed,whereby the surface speed thereof is equal to its web feed speedregardless of variations in diameter of one rewind roll with respect toother rewind rolls mounted adjacent thereto. In the embodiment of theinvention illustrated, rotary motion is imparted to the rewind rolls bya motor which drives a main rewind roll drive shaft which in turn drivesa plurality of individually mounted clutches, one being disposed on eachpair of rewind arms. A like plurality of tracking or follower rolls areprovided, each of which is adapted to resiliently engage the peripheryof its corresponding rewind roll with a preselected nip pressure orcontact force, And means are provided for successively pivoting therewind arms in selected increments in response to the build-up of therewind rolls.

A feature of this invention resides in the provision of a new andimproved rewind machine which is capable of accurately rewinding filmshaving high slip characteristics, which rewinds films having troublesomestretch characteristics, which provides positive control of the contactor nip pressure on each individual rewind roll and hence accuratelycontrols same, which compensates for rewind roll diameter differencesdue to the variation in caliber of the material being rewound, whichemploys rewind stations that are adjustable for accommodating variouswidth rewind rolls, with which the driving torque supplied to eachrewind roll is not affected by the weight of such roll during buildup,which allows out of round roll inertia in contact with a low inertiatracking roll, which allows individual rolls to reach individual speedswithout being trapped by the constant speed of a common contact drum,and which allows each rewind roll to determine its own rotational speedaccording to the requirements as determined by the characteristics ofthe film being rewound.

An aim of the present invention is to provide a new and improved rewindmachine with which the rewind roll core may be of lower quality and havelarger internal bore tolerances than heretofore though practical, whicheliminate-s points of lubrication necessary with prior art machines,which substantially increases the percentage of running time during theoperational cycle, and which reduces the percentage of rejected or scrapmaterial found in ordinary production runs. Other objects, features andadvantages will be apparent from the following description of oneembodiment of the invention, and the novel features will be particularlypointed out hereinafter in connection with the appended claims.

In the accompanying drawings:

FIG. 1 is an end elevation of a rewind machine constructed in accordancewith the invention with parts broken away to more clearly show certainfeatures;

FIG. 2 is a side elevation partially broken away to reveal theconstruction and operation of the means for supporting and driving therewind rolls;

FIGURE 3 is an enlarged sectional view taken along the line 3-3 of FIG.1 and showing a pair of rewind arms with associated means for holdingand driving the rewind roll;

FIG. 4 is an enlarged fragmentary sectional view showing in releasedposition the means for holding the rewind roll core during the rewindingoperation;

FIG. 5 is an enlarged end elevation partially in schematic showing meansfor controlling the angular position of the rewind arms;

FIG. 6 is an enlarged side elevation showing the means for controllingthe angular position of the rewind arms of FIG. 5;

FIG. 7 is an enlarged end elevation of the rewind drive and clutchcontrols;

FIG. 8 is an enlarged side elevation partially in schematic showing therewind drive and clutch controls;

FIG. 9 is an enlarged end elevation of the mechanism for controlling theposition of the tracking rolls;

FIG. 10 is an enlarged side elevation of the mechanism of FIG. 9;

FIG. 11 is an enlarged sectional view taken along the line ill-1i. ofFIG. 1; and

FIG. 12 is an enlarged plan view of the tracking roll and support meanstherefor.

In the illustrated embodiment of the invention, the rewind machinecomprise a front section and a rear section designated generally at 10and 12, respectively. At best seen in FIG. 1, the web of sheet material14 is recevied from a mill or supply roll (not shown) and passespartially around guide rolls 16 and 17, from whence it pass-es to atension roll 13 which is mounted in a guideway 2%. Linkage means 22operatively interconnect the tension roll 18 with a pneumatic cylinder24, to which air is supplied to or removed from, for purposes ofcontroling the linear tension of the web 14. Thence, the web passespartially around. a driven pull or feed roll 26 to a spreader roll 28which is provided for the purpose of transversely opening or spreadingthe web 14. The web then passes partially around two driven feed rolls30 and 32 Suitable means are provided to cut the web 14 into a pluralityof elongated longitudinal strips or sub-webs 34 and 36. In the presentembodiment, this is accomplished, by way of example, by a plurality ofslitters or cutters 38 positioned. adjacent a driven roll 40. It will beappreciated that the slitters or cutters 38 may produce a score cut,shear cut or razor cut, as desired. The cutters may be mounted upon ahorizontal slideway 39 which allows the cutters to be adjusted fordifferent subweb widths. The sub-webs 34 and 35 then pass partiallyaround a driven main pull roll 44- from which adjacent strips of webpass alternately to tracking rolls 46 and 48, and. thence to rewindrolls such as 50 and 52 which are formed on cores 54 and 56 carried bythe rewind arms in a manner which will be described more fullyhereinafter.

It will be appreciated that the rewind machine comprises a front sectionand a rear section 12 which are of similar construction and operate in asimilar manner and, therefore some portions of each section will bedescribed in detail hereinafter, it being understood. that thecorresponding portions in the other section are of similar constructionand operate in a similar manner. As best seen in FIG. 2, the frontsection 10 is adapted to form a plurality of rewind roll-s 50, 58 and 60which are each carried by a pair of rewind arms 62, 64 and 66, 68 and70, 72, respectively. Each pair of rewind arms are constructed andoperate in a similar manner and therefore for purposes of illustrationone of the pairs of rewind arms will be described in detail hereinafter.The inner ends of the rewind arms are removably secured to a rewind armsupporting shaft 74 and, as best seen in FIG. 1, rewind arm supportingshaft 74 is provided with a slideway 76 which mates with correspondingrecesses in the rewind. arms so that the rewind arm may belongitudinally positioned, as desired, to accommodate rewind rolls ofvarious widths. Clamp screws 78 are provided in order to retain therewind arms in their preselected positions, respectively. The rewind armsupporting or pivot shaft 74 is pivotally mounted on the main frame 80as by means of a pair of bearings 82 disposed at opposite ends of theshaft (FIG. 2). A pair of spaced brackets 84 are fixedly connected tothe rewind arm supporting shaft 74 for purposes of carrying a mainrewind roll drive shaft 86 which is rotatably mounted thereon as at 88.A gear 90 is fixed on one end of the main rewind roll drive shaft 86,which gear is driven by gear 91, which in turn, is driven by gear 92. Itwill be appreciated that gear 91 is freely mounted on shaft 74 as bymeans of bearing 94. Gear 92 is fixed on a shaft 96 rotatably mounted ona bearing housing 97 on frame 80 by means of bearings 98. A belt 106drivingly connects a pair of pulleys 100 and 102 which are fixed onshafts 96 and 104, respectively, shaft 104 extending from a motor 108.

In order to drive each individual rewind roll, main rewind roll driveshaft 86 is provided with a plurality of gears, a gear being disposedadjacent each of the rewind arms 64, 68 and 72, only one gear beingshown, which one being indicated by the reference numeral 110 in FIG. 1.The motor 108, through the aforementioned gear train, drives shaft 86and gears 110 at a speed in excess of the web feed speed, and. clutchmeans designated generally at 111 (FIG. 2) are interposed between themain rewind roll drive shaft 86 and each of the rewind rolls so thateach rewind roll determines its own rotational speed, whereby thesurface speed thereof is equal to its web feed speed regardless ofvariations in diameter of one rewind roll with respect to other rewindrolls and regardless of the speed of individual strips. Gear 110 drivesits corresponding mating gear 112 as shown in FIG. 1. As best seen inFIG. 3 gear 112 is provided with a hub portion 114 which is carried bydrive shaft 116, clamp plate 118 being provided for axially positioningthe gear and its hub. Drive shaft 116 rotates within a fixed member 120as by means of bearings 122 and 124, bearing 124 being held in axialposition by means of a lock ring 126, and member 120 being fixedlyconnected to the rewind arm 64 as by means of screws 128. One end ofshaft 116 is provided with a flange-like projection which carries dowelpins 130 and 132, the other end of the dowel pins engaging and holding aclutch pressure plate 134 forming part of the clutch 111. This carriesbearings 136 which support piston 138. Piston 138 is prevented fromrotating by a pin 142 which engages a slot in diaphragm clamp plate 140.A cover 146 is held in position by means of screws 148 and carries thediaphragm clamp support plate by means of screws 141, a diaphragm member144 being interposed between the plate 140 and the cover 146. The clutchpressure plate 134 bears against friction facing material 150 which isrigidly carried by a friction material plate 152 that is connected tothe drive pulley 154, drive pulley 154 being rotatably mounted onbearings 156. It will be appreciated that cover 146 is provided with achamber 158 having an inlet 160 through which fluid under pressureenters for purposes of actuating the clutch pressure plate 134 and,thereby controlling the torque transmission of the clutch mechanism and,hence, the torque output of the drive pulley 154. Clutch assemblies 111may be collectively controlled or each individual clutch may beindividually controlled.

Still referring to FIG. 3, drive pulley 154 is in driving engagementwith a toothed belt 162, which is in driving engagement with a driventoothed pulley 164 fixedly mounted on a core drive shaft 166 which inturn is rotatably mounted on the outer end of rewind arm 64 as by meansof bearings 168. The core 54 is carried at the outer end of the rewindarms 62 and 64 during the rewinding operation by means of chucks 171 and172, chuck 171 being affixed to and driven by core drive shaft 166, andchuck 172 being mounted on the end of a shaft 174 which is carried in abearing housing 176 by means of bearings 178. Chuck 172 is adapted foraxial movement for purposes of loading and unloading the core 54, FIG. 3showing the chuck 172 in engagement with the core 54 in the rewindingposition and FIG. 4 showing the chuck 1'72 removed from and out ofengagement with the core 54 for purposes of replacing the core. In orderto axially move the chuck 172, a crank arm 180 is pivotally mounted onrewind arm 62 by pin 182, one end of such crank arm being adapted toengage bearing housing 176 as at 184 and the other end thereof beingpivotally connected to a clevis 186 as by means of pin 188, clevis 186being fixedly connected to a piston rod 190 extending from the end of apneumatic cylinder 192. The other end of the pneumatic cylinder 192 ispivotally mounted on the rewind arm 62 by pin 194. The axial movement ofthe chuck 172 is controlled by means (not shown) of regulating the airpressure in the pneumatic cylinder 192 as required.

In order to provide positive control of the nip pressure for each rewindroll, a tracking roll assembly designated generally at 194 in FIG. 1 isprovided. It will be appreciated that an individual tracking rollassembly a is provided for each individual rewind roll. And, hence, thenip force for each rewind roll may be individually controlled andmaintained at the lowest possible value for maintaining just enough nipto remove the air from between adjacent layers of web being rewound andthus provide for accurate tracking of the slit strip onto the rewindroll. Further, it will be appreciated that the rewind torque isindependent of the nip force since there is no shaft to transfer nipforce to the core and thus increase drive torque. The nip force can beas heavy or light as desired without affecting the rewind torque. It isnoted that since the tracking roll remains stationary in space, thegeometry of the actuating cylinder is fixed, hence the nip force isconstant for constant pressure.

As best seen in FIGS. 1 and 12, the tracking roll 48 is supported at itsends by a tracking arm 196 which allows the roll 48 to rotate freely.The arm 196 is centrally pivotally mounted on a frame 198 as at 200(FIG. 12) by means of pin 201. The frame 198 is adjustably mounted onslideway 202 (FIG. 1) for purposes of aligning each individual trackingroll with respect to its corresponding rewind roll. It will beappreciated that the slideway 202 extends the entire width of themachine and a plurality of tracking roll assemblies are mounted thereon.The end of the arm 196 is pinned to connecting links 204 (FIG. 11) as bymeans of pin 206 and the connecting links are interconnected by a shaft208. A

universal joint 210 connects shaft 208 to a piston 212 extending from afluid cylinder 214 which is fixedly mounted with respect to the shaft208 and the tracking arm 196. Control of the fluid in the cylinder 214controls the nip pressure between the tracking roll and the rewind roll.Each nip pressure may be individually or collectively controlled and thenip pressure may be maintained constant or varied throughout the rewindcycle, as desired.

It will be noted that the arcuate travel of the tracking rolls isrelatively short compared to the arcuate travel required by the rewindroll as it builds up from an initial relatively small diameter to arelatively large diameter towards the end of the rewinding operation,and, therefore, the rewind arms are adapted to advance outwardly awayfrom the lay-on roll in successive steps or increments. This is effectedby means of a fluid cylinder 216 (FIGS. 2, 5 and 6) which is pivotallyconnected at one end thereof to the right hand frame 218 by bracket 219.A piston rod 220 extends from the other end of the fluid cylinder 216and is eccentrically connected to the rewind arm supporting shaft 74 asby yoke 222 provided for the purpose. As seen by the broken line in FIG.9, the universal joint 210 is provided with a surface 224 which isadapted to contact finger 226 depending from tray 228, tray 228 beingfixedly mounted on shaft 230. It will be appreciated that the shaft 230extends the entire width of the machine and is mounted by means ofbearings 232 and 234 on the frame 218 and 80, respectively. A pluralityof fingers 226 (FIG. 9) extend from the tray 228, one being provided foreach rewind roll. The first finger to be contacted by its respectivetracking roll assembly 194 actuates the finger 226 and thereby rotatesthe shaft 230. As seen in FIGS. 9 and 10, a hub 236 is mounted on shaft230 and is provided with a projecting member 238 for actuating a switchmechanism 239 to prevent over-travel of the shaft 230. The projectingmember 238 contacts the switch mechanism 239 which stops the entirerewind machine and thereby prevents hazardous breakage. A fluid valve240 is mounted on the frame 218 by means of bracket 242 andinterconnecting linkage 244 operatively connects the hub 236 to thefluid valve 240 so that in operation an angular movement of shaft 230provides a corresponding angular movement of valve 240. As best seen inFIG. 5, valve 240 is part of a fluid system comprising a fluid pump 246,a gauge 248 and interconnecting piping 250 which extends to the fluidcylinder 216. As described hereinbefore, the amount of fluid in thecylinder 216 controls the angle of inclination of the rewind arms. Itwill be appreciated that arm 196 returns to its original or neutralposition after the rewind arm has been rotated by hydraulic pressurefrom valve 240.

Turning again to FIGS. 5 and 6, a connecting rod 252 connects a coupling223 to plate 254 so that arcuate movement of shaft 74 is transmitted toarcuate movement of plate 254, coupling 223 being connected to shaft 74.As best seen in FIG. 8, plate 254 is fixedly attached to gear 256 bybolts such as 258 and both members are rotatably mounted on shaft 260which, in turn, is carried by the frame 218. Mounted on the plate 254 isa cam support 262 which carries a cam 264. The angular position of thecam is adjustable by means of an adjusting member 266 (FIG. 7), asdesired. This permits an operator to adjust the rate at which torque canbe increased to the rewind drive clutches and, therefore, permits thepreselection of a wide variety of torque winding patterns. A valvemember 268 (FIG. 8) is mounted on the frame 218 by means of bracket 270and a cam follower bracket 272 (FIGS. 7 and 8) is also mounted onbracket 270. A cam follower wheel 274 is rotatably mounted on thebracket 272 and is adapted to engage and follow the surface of the cam264 and thereby depress a pin 276 protruding from the valve 268 tothereby actuate the valve. Referring to FIG. 8, valve 268 is part of afluid system comprising a fluid source such as a pump 278, a gauge 280and a ratio control station 282. There are a plurality of outlets suchas 284 from the ratio control station 282 and each one leads to a clutch111. Actually each outlet 284 is connected to an inlet (FIG. 3) of aclutch 111. In operation movement of the rewind arm supporting shaft 74(FIG. 5) arcuately moves earn 264 (FIG. 8) and thereby actuates valve268 which operates the ratio control station 282 to control the clutches111 (FIG. 2). It will be appreciated that the clutches 111 may beindividually actuated in response to a preselected ratio of the movementof the valve 268 (FIG. 8) or they may be collectively operated inresponse to a preselected ratio of the movement of the valve 268, asdesired. Hence, an operator may select a variable amount of rewindclutch torque to satisfy a variety of rewind roll widths in a givenrewind section.

As best seen in FIG. 5, a bracket 286 carrying a contact 287 is fixedlyattached to the connecting rod 252 and a switch 2% is fixedly mounted onthe frame 218 in relative positions one with respect to the other sothat in the event of over-travel of the connecting rod 252 the contact287 will actuate the switch 288 and thereby close a circuit and stop theentire rewind machine.

Turning again to FIG. 8, a shaft 290 is rotatably mounted on frame 218by means of bracket 292 and said shaft is driven by means of driven gear294 fixedly connected thereto which in turn is driven by gear 256. Itwill be appreciated that gear 256 rotates a portion of a revolution inresponse to arcuate movement of the rewind arm supporting shaft 74 (FIG.5) through connecting rod 252 as described hereinbefore. A coupling 296(FIG. 8) connects shaft 290 with the stern 293 of a potentiometer 360.Thus, arcuate movement of the rewind arm supporting shaftcorrespondingly actuates the potentiometer 300. The potentiometer ispart of an electrical circuit comprising a source of electrical energy,a meter 362 and the motor 108 (FIG. 2). Thus it is seen that the speedof the motor 103 is controlled throughout the rewind cycle by the angleof inclination of the rewind arms. This reduces the clutch slippagerequired toward the end of the cycle, a factor which reduces the powerloss and reduces the amount of heat to be dissipated.

It will be understood that various changes in the details, materials andarrangements of parts which have been herein described and illustratedin order to explain the nature of the invention, may be made by thoseskilled in the art within the principle and scope of the invention asexpressed in the appended claims.

We claim:

1. A rewind machine comprising a pair of rewind arm supporting shafts, aplurality of pairs of rewind arms for each shaft, each pair beingmounted on said shafts at their inner ends respectively, means carriedby each pair of rewind arms at their outer ends for receiving a strip ofsheet material to be wound into a rewind roll, motor means for drivingsaid last named means, tracking means adapted to resiliently engage theperipheries of said rewind rolls, means for arcuately moving said rewindarm supporting shafts in response to the build-up of said rewind rollsrespectively, means for sensing the angular position of each of saidrewind arm supporting shafts, and control means for said motor meansoperable in response to the angular position of said rewind armsupporting shafts and including potentiometer means .actuatable inresponse to movement of said rewind arm supporting shafts and adapted tocontrol the electrical potential supplied to said motor means andthereby reduce the output speed of said motor means as the rewind rollsbuild up in diameter.

2. A rewind machine comprising a pair of rewind arm supporting shafts, aplurality of pairs of rewind arms for each shaft, each pair beingmounted on said shafts at their inner ends respectively, means carriedby each pair of rewind arms at their outer ends for receiving a strip ofsheet material to be wound into a rewind roll, clutch means having itspower output drivingly connected to said means for driving engagement,motive means for said clutch means, tracking means adapted toresiliently engage the peripheries of said rewind rolls, means forarcuately moving said rewind arm supporting shafts in response to thebuild-up of said rewind rolls respectively, means for sensing theangular position of each of said rewind arm supporting shafts, andcontrol means for said clutch means operable in response to the angularposition of said rewind arm supporting shafts.

3. A rewind machine according to claim 2 wherein said clutch means areslip clutches and fluid means control the amount of torque, and whereinsaidcontrol means for said clutch means comprises a pair of camsarcuately movable in response to the angular position of said rewind armsupporting shafts respectively, each of said cams being adjustable forproviding a preselected surface pattern during the rewind cycle, a camfollower adapted to follow said surface pattern, valve means actuatablein response to said cam follower, a ratio control station for receivingsignals from said valve means and adapted for controlling the fluid flowto each of the fluid means for controlling the amount of torque for eachclutch means.

4. A rewind machine comprising a pair of rewind arm supporting shafts, aplurality of pairs of rewind arms for each shaft, each pair beingmounted on said shafts at their inner ends respectively, means supportedby said rewind arms at their outer ends which means are adapted toreceive a strip of sheet material to be wound into a rewind roll, afirst arm of each pair of arms carrying at its outer end means fordriving engagement with said rewind rolls, respectively, clutch meanssupported at the inner end of each said first arm, each of said clutcheshaving its power output drivingly connected to said means for drivingengagement respectively, a pair of main rewind roll drive shafts fordriving said clutches respectively, motive means for said main rewindroll drive shafts, control means for each of said clutch means forindividually controlling the torque input to each rewind roll, atracking roll for each rewind roll, means for pivoting said trackingrolls for maintaining peripheral engagement between said tracking rollsand said rewind rolls respectively, and means for pivoting said rewindarms in response to the build-up of said rewind rolls.

5. A rewind machine comprising a plurality of pairs of rewind arms eachpair being pivotally mounted at their inner ends, a set of chuckscarried by each pair of rewind arms at their outer ends, each set ofchucks being adapted to releasably carry a rewind roll core forreceiving a strip of sheet material to be wound into a rewind roll, onechuck of each pair of chucks being mounted for axial movement withrespect to the other to release said cores respectively, means forcontrolling the movement of said chucks mounted for axial movementrespectively, means for driving one chuck of each pair of chucks, clutchmeans having their power outputs drivingly connected to said means fordriving said chucks respectively, motive means for said clutch means,control means for said clutch means for individually controlling thetorque input to each rewind roll, a tracking roll for each rewind roll,means for pivoting said tracking rolls for maintaining peripheralengagement between said tracking rolls and said rewind rollsrespectively, and means for pivoting said rewind arms in response to thebuild-up of said rewind rolls.

6. A rewind machine comprising a pair of rewind arm supporting shafts, aplurality of pairs of rewind arms for each shaft, each pair beingpivotally mounted on said shafts at their inner ends respectively, a setof chucks including a first chuck and a second chuck carried by eachpair of rewind arms at their outer ends, each set of chucks beingadapted to releasably carry a rewind roll core for receiving a strip ofsheet material to be wound into a rewind roll, the first chucks beingadapted for movement to release said cores respectively, fluid means ofor controlling the movement of each of said first chucks, means fordriving the second chucks respectively, clutch means having their poweroutputs drivingly connected to said means for driving said second chucksrespectively, motive means for said clutch means, control means for saidclutch means for individually controlling the torque input to eachrewind roll, a tracking roll for each rewind roll, means for pivotingsaid tracking rolls for maintaining peripheral engagement between saidtracking rolls and said rewind rolls respectively, and means forpivoting said rewind arm supporting shafts in response to the build-upof said rewind rolls respectively.

7. A rewind machine comprising a pair of rewind arm supporting shafts, aplurality of pairs of rewind arms for each shaft, each pair beingmounted on said shafts at their inner ends, means carried by each pairof rewind arms at their outer ends for receiving a strip of sheetmaterial to be wound into a rewind roll, means including a clutch fordriving said last named means, a tracking roll for each rewind roll, apivotable tracking roll arm for supporting each tracking roll, means forcontrolling the pivotal movement of said tracking roll arms to obtainpreselected nip pressures between each tracking roll and itscorresponding rewind roll respectively, and means for arcuately movingeach of said rewind arm supporting shafts in response to the build-up ofsaid rewind rolls respectively.

8. A rewind machine comprising a pair of rewind arm supporting shafts, aplurality of pairs of rewind arms for each shaft, each pair beingmounted on said shafts at their inner ends, means carried by each pairof said rewind arms at their outer ends for receiving a strip of sheetmaterial to be wound into a rewind roll, means including a clutch fordriving said last named means, a tracking roll for eachrewind roll, aplurality of tracking roll arms for supporting said tracking rollsrespectively, means mounting said tracking roll arms for pivotalmovement for maintaining peripheral engagement between said trackingrolls and said rewind rolls respectively, fluid force means forcontrolling the nip force between the tracking rolls and the rewindrolls respectively when the diameter of at least one rewind roll isgreater than the diameter of other rewind rolls corresponding to thesame rewind arm supporting shaft, means for rotating said rewind armsupporting shafts in response to the build-up of said rewind rolls.

9. In a rewind machine, a frame, a pair of rewind arm supporting shaftscarried by said frame in spaced relationship one with respect to theother, a plurality of pairs of rewind arms for each shaft, each pairbeing mounted on said shafts at their inner ends, means carried by eachpair of said rewind arms at their outer ends for receiving a strip ofsheet material to be wound into a rewind roll, clutch means mounted onone of each pair of said rewind arms for driving said last named means,means mounted on said frame for driving said last named means, supportmeans mounted on said frame, a like plurality of tracking roll bracketsmounted on said support means for longitudinal adjustment depending uponthe positioning of said rewind rolls, a plurality of tracking rollsrotatably mounted on said tracking roll brackets respectively and beingadapted for peripheral engagement with said rewind rolls respectively,fluid means for pivoting said tracking roll brackets for controlling thenip force between the tracking rolls and the rewind rolls respectively,and means for pivoting said rewind arm supporting shafts in response tothe build-up of said rewind rolls.

10. A rewind machine comprising a pair of rewind arm supporting shafts,a plurality of pairs'of rewind arms for each shaft, each pair beingmounted on said shafts at their inner ends, means carried by each pairof said rewind arms at their outer ends for receiving a strip of sheetmaterial to be wound into a rewind roll, means for driving said lastnamed means, a tracking roll for each rewind roll, supporting means foreach of said tracking rolls, means for pivoting said supporting means tomaintain peripheral engagement between said tracking rolls and saidrewind rolls respectively, fluid piston means for successively rotatingeach of said rewind arm supporting shafts in increments of a revolution,fluid valve means operable by movement of at least one of saidsupporting means for actuating said fluid piston means.

11. In a rewind machine, a frame, a pair of rewind arm supporting shaftscarried by said frame, a plurality of pairs of rewind arms for eachshaft, each pair being mounted on said shaft at their inner ends, meanscarried by each pair of said rewind arms at their outer ends forreceiving a strip of sheet material to be wound into a rewind roll,means mounted on said frame for driving said last named means, supportmeans mounted on said frame, a like plurality of tracking roll bracketspivotally mounted on said support means, a plurality of pairs oftracking rolls rotatably mounted on said tracking roll bracketsrespectively and being adapted for peripheral engagement with saidrewind rolls respectively, means operatively connected to each trackingroll bracket for controlling the nip force between the tracking rollsand the rewind rolls respectively, fluid piston means for successivelyrotating each of said rewind arm supporting shafts in increments of arevolution, a pair of cross shafts mounted on said frame, a plurality offingers depending from said cross shafts, said fingers being engageablewith said tracking roll brackets respectively, a valve operativelyconnected to each of said cross shafts, means for operatively connectingsaid fluid piston means with said valves respectively, whereby movementof one of said tracking roll brackets actuates its corresponding fingerwhich actuates its corresponding cross shaft which actuates itscorresponding valve which actuates its corresponding fluid piston torotate its corresponding rewind arm supporting shaft an increment of arevolution.

12. A rewind machine comprising a frame, a pair of rewind arm supportingshafts carried by said frame, a plurality of pairs of rewind arms foreach shaft, each pair being mounted on said shafts at their inner ends,a pair of chucks carried by each pair of rewind arms at their outer endsfor receiving a rewind roll core on which a strip of sheet material isto be wound into a rewind roll, one of said arms carrying at its outerend means for driving engagement with one of said chucks, clutch meanshaving its power output drivingly connected to said means for drivingengagement, motive means for said clutch means, control means for saidclutch means for individually controlling the torque input to eachrewind roll, a slideway mounted on said frame, a like plurality of pairsof tracking roll brackets pivotally mounted on said slideway forlongitudinal movement with respect to said slideway depending upon thepositioning of said rewind rolls, a plurality of pairs of tracking rollspivotally mounted on said tracking roll brackets respectively, saidtracking rolls being adapted for rotary motion and being further adaptedfor peripheral engagement with said rewind rolls respectively, fluidpressure means pivotally connected to each tracking roll bracket forcontrolling the nip force between the tracking rolls and the rewindrolls respectively, means for successively rotating said rewind armsupporting shaft in increments of a revolution, means mounted on atleast one of said tracking roll brackets operable in response tomovement thereof for actuating said last named means.

13. A rewind machine comprising a frame, a pair of rewind arm supportingshafts carried by said frame, a plurality of pairs of rewind arms foreach shaft, each pair being mounted on said shafts at their inner ends,means carried by each pair of said rewind arms at their outer ends forreceiving a strip of sheet material to be wound into a rewind roll, oneof said arms carrying at its outer end means for driving engagement withsaid last named means, slip clutch means having its power outputdrivingly connected to said means for driving engagement, fluid meansfor controlling the amount of slippage, motor means for said clutchmeans, a tracking roll for each rewind roll, a plurality of trackingroll arms for supporting said tracking rolls respectively, meansmounting said tracking roll arms for pivotal movement for maintainingperipheral engagement between said tracking rolls and said rewind rollsrespectively, fluid piston means for controlling the nip force betweenthe tracking rolls and the rewind rolls respectively when the diameterof at least one rewind roll is greater than the diameter of other rewindrolls corresponding to the same rewind arm supporting shafts, fluidpiston means for successively rotating each of said rewind armsupporting shafts in increments of a revolution, a pair of cross shaftsmounted on said frame, a plurality of fingers depending from said crossshafts, said fingers being engageable with said tracking roll armsrespectively, a valve operatively connected to each of said crossshafts, means for operatively connecting said fluid piston means withsaid valves respectively, means for sensing the angular position of eachof said rewind arm supporting shafts, and control means for said motormeans operable in response to the angular position of said rewind armsupporting shafts and including potentiometer means actu atable inresponse to movement of said rewind arm supporting shafts and adapted tocontrol the electrical potential supplied to said motor means andthereby reduce the output speed of said motor means as the rewind rollsbuild up in diameter, and control means for said clutch means operablein response to the angular position of said rewind arm supportingshafts, said last named control means comprising a pair of camsarcuately movable in response to the angular position of said rewind armsupporting shafts respectively, each of said cams being adjustable forproviding a preselected surface pattern during the rewind cycle, a camfollower adapted to follow said surface pattern, valve means actuatablein response to said cam follower, a ratio control station for receivingsignals from said valve means and adapted for controlling the fluid flowto each of the fluid means for controlling the amount of clutch slippagefor each clutch means.

References Cited by the Examiner UNITED STATES PATENTS 3,086,726 4/1963Aaron 242-56.5 X 3,179,349 4/1965 Aaron et al 242-- 3,207,452 9/1965Haskin et a1 242-681 X FOREIGN PATENTS 940,661 10/ 1963 Great Britain.

FRANK I. COHEN, Primary Examiner.

W. S. BURDEN, Assistant Examiner.

10. A REWARD MACHINE COMPRISING A PAIR OF REWIND ARM SUPPORTING SHAFTS,A PLURALITY OF PAIRS OF REWIND ARMS FOR EACH SHAFT, EACH PAIR BEINGMOUNMTED ON SAID SHAFTS AT THEIR INNER ENDS, MEANS CARRIED BY EACH PAIROF SAID REWIND ARMS AT THEIR OUTER ENDS FOR RECEIVING A STRIP OF SHEETMATERIAL TO BE WOUND INTO A REWIND ROLL, MEANS FOR DRIVING SAID LASTNAMED MEANS, A TRACKING ROLL FOR EACH REWIND ROLL, SUPPORTING MEANS FOREACH OF SAID TRACKING ROLLS, MEANS FOR PIVOTING SAID SUPPORTING MEANS TOMAINTAIN PERIPHERAL ENGAGEMENT BETWEEN SAID TRACKING ROLLS AND SIADREWIND ROLLS RESPECTIVELY, FLUID PISTON MEANS FOR SUCCESSIVELY ROTATINGEACH OF SAID REWIND ARM SUPPORTING SHAFTS IN INCREMENTS OF A REVOLUTION,FLUID VALVE MEANS OPERABLE BY MOVEMENT OF AT LEAST ONE OF SAIDSUPPORTING MEANS FOR ACTUATING SAID FLUID PISTON MEANS.